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#include <errno.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include "util.h"
void make_nonblock_fd(int fd) {
int v;
if ((v = fcntl(fd, F_GETFL)) >= 0)
if (!(v & O_NONBLOCK))
fcntl(fd, F_SETFL, v|O_NONBLOCK);
}
void peer_to_string(char *c, size_t l, int fd) {
struct stat st;
assert(c && l && fd >= 0);
if (fstat(fd, &st) < 0) {
snprintf(c, l, "Invalid client fd");
return;
}
if (S_ISSOCK(st.st_mode)) {
union {
struct sockaddr sa;
struct sockaddr_in in;
struct sockaddr_un un;
} sa;
socklen_t sa_len = sizeof(sa);
if (getpeername(fd, &sa.sa, &sa_len) >= 0) {
if (sa.sa.sa_family == AF_INET) {
uint32_t ip = ntohl(sa.in.sin_addr.s_addr);
snprintf(c, l, "TCP/IP client from %i.%i.%i.%i:%u",
ip >> 24,
(ip >> 16) & 0xFF,
(ip >> 8) & 0xFF,
ip & 0xFF,
ntohs(sa.in.sin_port));
return;
} else if (sa.sa.sa_family == AF_LOCAL) {
snprintf(c, l, "UNIX client for %s", sa.un.sun_path);
return;
}
}
snprintf(c, l, "Unknown network client");
return;
} else if (S_ISCHR(st.st_mode) && (fd == 0 || fd == 1)) {
snprintf(c, l, "STDIN/STDOUT client");
return;
}
snprintf(c, l, "Unknown client");
}
int make_secure_dir(const char* dir) {
struct stat st;
if (mkdir(dir, 0700) < 0)
if (errno != EEXIST)
return -1;
if (lstat(dir, &st) < 0)
goto fail;
if (!S_ISDIR(st.st_mode) || (st.st_uid != getuid()) || ((st.st_mode & 0777) != 0700))
goto fail;
return 0;
fail:
rmdir(dir);
return -1;
}
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